How do you put in a power cord for a 5150 dell?

I have a dell inspiron 5150 and I ordered a power cord for it. It came but with a different end to plug in and I dont know if it will work unless I have to take out something or whatever. Someone help!How do you put in a power cord for a 5150 dell?u gotta bring another one... and also it is kinda hard to judge without seeing it.. but sometimes the plug is like smaller from the one in the motherboard and MAYBE it will work.. but i prefer that u bring the one suitable for it.. cuz it will make for u conflicts or ur motherboard will not work as full performance